diff -Nru alsa-lib-1.2.3.2/debian/changelog alsa-lib-1.2.3.2/debian/changelog
--- alsa-lib-1.2.3.2/debian/changelog	2020-11-09 06:26:27.000000000 +0000
+++ alsa-lib-1.2.3.2/debian/changelog	2021-04-06 19:26:31.000000000 +0000
@@ -1,3 +1,11 @@
+alsa-lib (1.2.3.2-1ubuntu3.2) groovy; urgency=medium
+
+  * d/p/0001-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch:
+     conf: USB - add "Cmedia Audio" to USB-Audio.pcm.iec958_device
+     (LP: #1921452)
+ 
+ -- Shengyao Xue <shengyao.xue@canonical.com>  Tue, 06 Apr 2021 21:26:31 +0200
+
 alsa-lib (1.2.3.2-1ubuntu3.1) groovy; urgency=medium
 
   * d/p/0001-ucm-handle-correctly-Linked-configuration.patch
diff -Nru alsa-lib-1.2.3.2/debian/patches/0001-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch alsa-lib-1.2.3.2/debian/patches/0001-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch
--- alsa-lib-1.2.3.2/debian/patches/0001-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch	1970-01-01 00:00:00.000000000 +0000
+++ alsa-lib-1.2.3.2/debian/patches/0001-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch	2021-04-06 19:25:47.000000000 +0000
@@ -0,0 +1,25 @@
+From 879d57d979b59be8632ba788d5f567f2b6ec0c19 Mon Sep 17 00:00:00 2001
+From: Hui Wang <hui.wang@canonical.com>
+Date: Mon, 1 Mar 2021 13:51:54 +0800
+Subject: [PATCH] conf: USB - add "Cmedia Audio" to USB-Audio.pcm.iec958_device
+
+Otherwise, there will be a "Digital Output(S/PDIF)-Cmedia Audio" from
+Gnome UI, but there is no this physical interface on the card.
+
+Signed-off-by: Hui Wang <hui.wang@canonical.com>
+---
+ src/conf/cards/USB-Audio.conf | 1 +
+ 1 file changed, 1 insertion(+)
+
+Index: alsa-lib-1.2.3.2/src/conf/cards/USB-Audio.conf
+===================================================================
+--- alsa-lib-1.2.3.2.orig/src/conf/cards/USB-Audio.conf
++++ alsa-lib-1.2.3.2/src/conf/cards/USB-Audio.conf
+@@ -47,6 +47,7 @@ USB-Audio.pcm.iec958_device {
+ 	"Andrea PureAudio USB-SA Headset" 999
+ 	"Blue Snowball" 999
+ 	"C-Media USB Headphone Set" 999
++	"Cmedia Audio" 999
+ 	"HP Digital Stereo Headset" 999
+ 	"GN 9330" 999
+ 	"Logitech Speaker Lapdesk N700" 999
diff -Nru alsa-lib-1.2.3.2/debian/patches/series alsa-lib-1.2.3.2/debian/patches/series
--- alsa-lib-1.2.3.2/debian/patches/series	2020-11-09 06:26:27.000000000 +0000
+++ alsa-lib-1.2.3.2/debian/patches/series	2021-04-06 19:25:25.000000000 +0000
@@ -7,3 +7,4 @@
 0001-ucm-add-a-check-for-the-empty-configuration.patch
 
 0001-ucm-handle-correctly-Linked-configuration.patch
+0001-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch